Muffler construction



Aug. 9', 1927. 1,638,309

T. S. KEMBLE MUFFLER CONSTRUCTION Filed April 5. 1922 '2 Sheets-Sheet 1 'IlllllllllllllllflllllllllIIIIIIIIIIIIIIIIIIIIIIIIIIIlIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII'll!IIIII'I Frill/101111).

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T. S. KEMBLE MUFFLER CONSTRUCTION Filed April 5. 1922 2 Sheets-Sheet 2 Patented Aug. 9, 1927.

UNITED STATES THOMAS S. KEMBLE, F LAKEWOOD, OHIO.

MUFFLER oousrnuorrou.

Application'filed April 3,

The present invention relates to a muffler for use with internal combustion engines, or under any circumstances where a pulsating gaseous stream is discharged into the at- .mosphere, as for instance, the smoke pipe of a locomotive or the exhaust pipe ofa steam engine.

The mufiler ofthe present invention is similar in some respects to the muffler disclosed in my-Patent No. 1,357,992, and in my application for patent Serial No.'514,-

566, filed Nov. 12, 1921.

In certain. features of construction, however, and in certain features of operation,

it differs from both of the preceding.

The object of the invention is to provide a muffler which is particularly intended for use under circumstances Where it is desired to eliminate as much of the noise in connection with the exhaust of an internal combustion engine as is possible, and without creating an undue back pressure. It has the further advantage that a tail pipe may beused in connection'with it, to carry the exhaust gases to a point remote from the muffler. 1 I

Reference should be had to the accompanying drawings forming a part of this specification, in which Fig. 1 is a sectional elevation of a muffler embodying my invention; Fig. 2 is a top plan view; Fig. 3 is an end elevation; Fig. 4 is a section on the line H of Fig. 1; Fig. 5 isa sectional elevation of a modified form; Fig. 6 is a part section and part elevation of a modified con- 'struction; Fig. 7 is a section of a portion of the device shown in Flg. 5

Reference should be had to the accompanying drawings which show several different forms or devices in which the present invention may be embodied, and of all these various forms it maybe said that they provide a direct "passage for the pulsating gaseous stream, and a chamber or enlarged secondary passage which is connected by suitable openings with the-main passage so that gas may pass out of the direct stream into the chamber, thereby relieving the pres sure incident to the pufi's of the gaseous matter in the main stream,'and this gas which passes into the enlarged chamber is drawn back again into the main stream through the :opening or openings which establish communication between the direct passage and the chamber.

In Fig. l a construction is shown wherein 1922. Serial no. 549,010.

there is a conduit 1 providing a direct passageway for the travel of-the gas and a chambered member 2 at one side of the direct passageway, and this chambered portion communicates with the main passageway by means of openings 3 and {t which are arranged ad acent the opposite ends of the chambered portion 2. It is not intended to limit the invention to the precise form of the chambered member and the direct passageway as shown, but for a fuller explanation it may be said that the centralportion of the device may be considered a cylindrical shell like member 5. at the ends of'which are similar members which assume the form of oblique cones, as indicated at 6.

The direct passageway 1 may be formed by providing a cylindrical member or partly cylindrical member 7 which eo-operates with the lower rounding surface of the cylindrical portion 5 and oblique conical portion 6 thereby forming a substantially tubular passageway 1'.' The member 7 will be cut out to provide openings, as indicated at 3 and- 4.

In using this device one end of the same will be connected to the exhaust manifold of an engine or any other device from which there is emitted a pulsating gaseous stream, and the opposite end of the device here described may be attached to a tail pipe for conducting the gaseous products so as to discharge them at any given point, or such a pipe may be omitted.

When a pulsating gaseous stream enters 90 at one end of the tubular portion 7 it may enter the direct passageway 1, but portions of this gaseous stream will. enter into the chambered portion 2 through the opening 3 or 4, as the case may be, and thus relieve the pressure of the pufis which are passing through the device, and this same gas which passes into the chamber 2 will at some time thereafter again enter the main stream line of the gas through either of the openings 3 M4, as the case may be.

Referring to Fig. 5, which is a modified form, 10 is an elongated tube which as shown is slightly tapered, but thevinventionis not limited to a tapered form, as atube of con.- stant. diameter may be used with up roximately the same results as when using a tapered tube. This tube is providedwith a large number of openings which openings extend substantially from one end of the no tube to the other.

These openings may be of any I desired 7 form, that is, they may be slot-like or round, or they may be formed as su gested in Fig. and more clearly shown in 1g. 7, by making a cut in the metal and elevating one of theFedge s7 of the cut such as indicated at 11 In 1 Sui ounding the tube is a casing 12 which in the resent instance is shown as tapering, but it should be noted that the casing is not necessarily tapering, as will be later explained in connection with Fi 6. This casing is secured to the tube 10 a jacent the outer end thereof, as indicated at 12, and is also secured to the inner end of the tube as indicated at 11".

.The inner end of the tube 11 is of suit-= able size and shape to engage with the end of the exhaust manifold of an engine which is indicated at 13.

If desired braces such as indicated at 14 maybe provided within the casing 12 In Fig. 6there is shown an inner tube 15 which as ap ears in the drawing is slightlyletapering, ut as remarked with respect to' t s owing in Fig. 5, this tube is not necessarily limited to a tapering form. The tube is rovided with a plurality of openings, suc' as indicated at 16, and these .openings may be round holes as indicated, or they may be made of tapering form which is shown in Figs. 5 and 7. These 0 enings extend substantially throughout t is length of the tube 15.. v

Surrounding. the tube 15 is a casin 17. .This casing is substantially a cylinfrical casing, except thatthe ends where it is caused to slant as indicated at 17, 17 This isfor the purpose of securin the casing 17 to the opposite ends of the to 'e 15.

0 It will be noted in the construction shown in Figs. 1, 5 and 6, the surrounding casings indicated at 5, 12 and 17 are imperforate,

- tight.-

and are closed at their end portions, thereby providing a chamber surrounding the central tubular member, which cas ng is air The tubes forming direct passageways,

" -such as represented at 7, 10 and 15, are opentubes'it may find exit through from end to end, and'free from obstruction.

rounding each inner tube, and thereby serving to diminish the pressure, and consequent ly the noise incident to the exhaust of the gases. As before stated, this chambered portion surrounding an inner tube is closed, and while the gas may expand into this chambered ,portion upon an impulse of the exhaust gas it will not remain in the chambered portion, because followin each impulse is'a re- -lief of pressure, or w lat may be termed a suction, so that the gas which passes into the chambered portion finds its way to the tubular member '6, although it ma well be that the gas that enters into the c iambered portions through one or more of the openings does not return to the tubular member through the same openin In all of the forms of t eidevice described, the net effect of passing exhaust gases throu h the direct passageway with its surroun ing chamber, is to materially reduce the noise which would otherwise be incident to the exhaust of the gases against the atmospheric ressure. i

, Due to t e fact that the inner tube is entirely open and unobstructed the back pressure which is incident to the use of the device described is so small as to be practically ne ligible.

flaving described my invention, I claim A mufiier adapted to form the discharge section of an engine exhaust conduit and having an elongated im erforate tubular outer casing of greater iameter than the exhaust conduit and having a conical end with an openin adapted to receive the exhaust conduit, t e opposite end of said casing being conical and having an opening through which the gases are discharged, a tubular member it in said casing in alignment with the ex aust conduit and extending from one conical end portion of the casing to the other, said tubular member being of substantially the same size at its inlet end as the exhaust conduit and forming a direct and unobstructed passageway for gases discharged from the exhaust conduit, the space between said tubular member and outer casing being in communication with the direct passageway adjacent the inlet and outlet ends of the mufiler and forming an elonglated unobstructed auxiliary passageway om the'inlet to the outlet end of the mufller, the said assageways bein of such 1e h and relative cross-section'a areas'that substantial portions of each discharge of exhaust gases may escape laterally to the auxiliary passageway at the inlet end, fiow' through the same toward the discharge'end of the mufiler andreturn into the direct passa eway at the discharge end of the muflier.

my signature.

- moms s.

n testimony whereof, I hereunto aflix 

